package diko_parent.eduservice.listener;

import com.alibaba.excel.context.AnalysisContext;
import com.alibaba.excel.event.AnalysisEventListener;
import com.baomidou.mybatisplus.core.conditions.query.QueryWrapper;
import com.diko.config.exceptionhandler.myException;
import diko_parent.eduservice.entity.Subject;
import diko_parent.eduservice.entity.excel.subjectData;
import diko_parent.eduservice.service.SubjectService;

/**
 * @author Emma Li
 * @date 2020/9/23 - 21:31
 */
public class SubjectExcelListener extends AnalysisEventListener<subjectData> {

    //SubjectExcelListener不能交给spring进行管理，需要自己new，不能注入其他对象
    //不能实现数据库操作
    //可以使用有参构造解决此问题
    public SubjectService subjectService;
    public SubjectExcelListener(){}
    public SubjectExcelListener(SubjectService subjectService){
        this.subjectService=subjectService;
    }

    //一行一行读取
    @Override
    public void invoke(subjectData user, AnalysisContext analysisContext) {
        if(user==null){
            throw new myException(20001,"文件数据为空");
        }

        //判断一级分类是否重复
        Subject existOneSubject=this.existOneSubject(subjectService,user.getOneSubjectName());
        if(existOneSubject==null){
            existOneSubject = new Subject();
            existOneSubject.setTitle(user.getOneSubjectName());
//            existOneSubject.setParentId(Long.parseLong("0"));
            existOneSubject.setParentId("0");
            subjectService.save(existOneSubject);
        }

        //获取一级分类id值
        String pid = existOneSubject.getId();
        //添加二级分类
        Subject existTwoSubject = this.existTwoSubject(subjectService,user.getTwoSubjectName(), pid);
        if(existTwoSubject == null) {
            existTwoSubject = new Subject();
            existTwoSubject.setTitle(user.getTwoSubjectName());
            existTwoSubject.setParentId(pid);
            subjectService.save(existTwoSubject);
        }
    }



    //判断一级分类不能重复添加
    private Subject existOneSubject(SubjectService subjectService,String name){
        QueryWrapper<Subject> wrapper = new QueryWrapper<>();
        wrapper.eq("title",name);
        wrapper.eq("parent_id","0");
        Subject oneSubject = subjectService.getOne(wrapper);
        return oneSubject;
    }

    //判断二级分类不能重复
    private Subject existTwoSubject(SubjectService subjectService,String name,String pid){
        QueryWrapper<Subject> wrapper = new QueryWrapper<>();
        wrapper.eq("title",name);
        wrapper.eq("parent_id",pid);
        Subject twoSubject = subjectService.getOne(wrapper);
        return twoSubject;
    }

    @Override
    public void doAfterAllAnalysed(AnalysisContext analysisContext) {

    }
}
